What Are Sterile Neutrinos?

We've figured out that 95% of the universe is totally invisible. Does that mean they're also intastable? Like what does that neutrino taste like? I don't know. We do have three flavors of neutrinos even though we have no idea which ones are delicious. And it's embarrassing that my UK accent is so bad because I actually am a citizen of the UK and my father grew up in London.